K2: Do not use KFunctionN as representation type for adapted references

Beside some corner cases, it's already prohibited in K1 because
adaptation have a bit strange nature
(they don't represent any existing real function exactly)

^KT-55137 Fixed

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java

@@ -3117,6 +3117,12 @@ public class DiagnosticTestGenerated extends AbstractDiagnosticTest {
                     KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/diagnostics/tests/callableReference/adapted"), Pattern.compile("^(.*)\\.kts?$"), Pattern.compile("^(.+)\\.fir\\.kts?$"), true);
                 }
 
+                @Test
+                @TestMetadata("noKFunctionForAdaptation.kt")
+                public void testNoKFunctionForAdaptation() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/callableReference/adapted/noKFunctionForAdaptation.kt");
+                }
+
                 @Test
                 @TestMetadata("simpleAdaptationOutsideOfCall.kt")
                 public void testSimpleAdaptationOutsideOfCall() throws Exception {

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java

@@ -18319,6 +18319,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             runTest("compiler/testData/codegen/box/fir/assertEqualsFakeOverride.kt");
         }
 
+        @Test
+        @TestMetadata("callableReferenceConversionTopLevel.kt")
+        public void testCallableReferenceConversionTopLevel() throws Exception {
+            runTest("compiler/testData/codegen/box/fir/callableReferenceConversionTopLevel.kt");
+        }
+
         @Test
         @TestMetadata("callableReferenceToJavaField.kt")
         public void testCallableReferenceToJavaField() throws Exception {